There are MANY eateries at WDW - and LOTS of varied opinions on the DIS. Without knowing your family personally, and your tastes, it's really impossible for us to say which places you'll like best. Some of my favorite places have been ripped by others, and some places that others have said are great - we found just so-so (Flame TRee BBQ, for one). nothing is really BAD at WDW, so pick the ones that appeal to you.
First, a few universal truths: Generally, the pizza at WDW is not great, esp. if you've had the NY or Chicago kind. If you love Dominoes, you'll likely find it acceptable.
Most people can't stand the tap water in FL - though most places are filtering it now. If cold and filtered, it's not too bad. drinking lots of water is important; bottled water is good, but not at WDW prices. bringing evena six pack of bottles is a good idea if you can.
I've been to WDW like 20 times and never done Hoop-De-Do, so it's hardly a must, IMO. Part of it for us is getting over there. Read below.
The princess meal in the castle (There are 3: b, l, d) is hard to get. I found it overrated; the reason to do it is to see the inside of the castle, not the food or the interaction. The princesses' interactions were mostly pretty quick, IMO. I've never done the Norway meal, but menu doesn't really appeal to me. There is a third option though - 1900 Park Fare - The list of princesses varies with the time of day. It's a great place to bring a little girl who is all dressed up...the Grand Floridian is really elegant, and you may well see a real life princess, er bride, while you are there. Whichever you pick, also be aware that most young girls will have princess attire of some kind, you might want to hop on the bandwagon.
No character meal is going to be quiet. While they are lively and fun, remember, your senses are going to be stimulated ALL DAY. ALL DAY you will smell, see, hear, touch, and taste Disney. Until you've been there, it's hard to appreciate the impact this will have on you. It's exhilarating, but exhausting. Some small children love it, others find it overstimulating. There are two things you can do to combat this - napping/quiet time (room, bus rides, maybe pool time), and quiet meals. We don't know your family, some kids love to nap. Usually the kids in our family vigorously protest the thought of a nap while at WDW, as do the adults.
Limiting yourself to one or two character meals total and try to have one or two relatively quiet meals each day. A simple solution is to get food from your resort food court and bring it outside or back to the room - this works great for breakfast. Another quiet dining option is to head to a resort for lunch. A third option is to dine at a non-buffet. the last may not be totally quiet, but won't be as hectic as Hoop-de-doo or a character meal. If H-d-d is somethig you're excited to see, then by all means - see it - just make sure you plan a little quiet time into the same day somehow.
and Whispering Canyon Cafe 
